FB_CTRL_TempController

The temperature controller function block FB_CTRL_TempController has various inputs and outputs, which are described below. All the controller's parameters are passed to it via structures. The structures and enums are defined here.

Function block

FB_CTRL_TempController 1:

Interface

VAR_INPUT
    eCtrlMode : E_CTRL_MODE; (* controller mode: passive, activ,check *)
    bSelSetpoint : BOOL; (* FALSE = setpoint 1, TRUE = setpoint 2*)
    fW1                     : FLOAT; (* first setpoint *)
    fW2                     : FLOAT; (* second setpoint *)
    fX                      : FLOAT; (* actual value *)
    fYManual                : FLOAT; (* manual control value *)
(* alarming inputs *)
    bOpenThermocouple       : BOOL; (* thermocouple *)
    bReverseThermocouple    : BOOL;
    bBackVoltage            : BOOL;
    bLeakage                : BOOL; (* heating system *)
    bShortCircuit           : BOOL;
    bOpenCircuit            : BOOL;
    sParaControllerExternal : ST_CTRL_ParaController; (* external controller parameter set *)
END_VAR
VAR_IN_OUT
    sControllerParameter : ST_CTRL_TempCtrlParameter; (* controller
parameter set *)
END_VAR
VAR_OUTPUT
    (* control output *)
    fYAnalog : FLOAT; (* control value analog *)
    bYPWMPos : BOOL; (* control value PWM *)
    bYPWMNeg : BOOL; (* control value PWM *)
    bYDigPos : BOOL; (* 3-Point: control value digital positive*)
    bYDigNeg : BOOL; (* 3-Point: control value digital negative*)
    (* alarming *)
    dwAlarm  : DWORD; (* max. 32 alarms *)
    (*quality of control*)
    fMaxOverShoot : FLOAT;
    tStartUpTime  : TIME;
    (* state *)
    eCtrlState    : E_CTRL_STATE := eCTRL_STATE_IDLE;
    (* controller parameter *)
    sParaControllerInternal : ST_CTRL_ParaController;
    (* general errors *)
    bError : BOOL;
    eErrorId : E_CTRL_ErrorCodes;
END_VAR

Inputs

Name	Unit	Value range	Description
`eControlMode`	1	E_CTRL_MODE	Mode switching.
`bSelSetpoint`	1	[TRUE,FALSE]	Selects one of two possible setpoints. FALSE selects the normal setpoint, while TRUE selects the standby setpoint.
`fW1`	°C	LREAL	Setpoint.
`fW2`	°C	LREAL	Standby setpoint, generally smaller than fW1. fSelSetpoint can be used to switch between fW1 and fW2.
`fX`	°C	LREAL	Actual value. This value must be converted to LREAL.
`fYManual`	-100% - +100%	LREAL	Control value in manual operation.
`bOpenThermocouple`	1	[TRUE,FALSE]	The thermocouple is open if TRUE. Must be indicated by the hardware (e.g. KLxxxx).
`bReverseThermocouple`	1	[TRUE,FALSE]	TRUE indicates that the thermocouple has been connected with the wrong polarity. Must be indicated by the hardware.
`bBackVoltage`	1	[TRUE,FALSE]	TRUE indicates that the input voltage at the thermocouple is too high. Must be indicated by the hardware.
`bLeakage`	1	[TRUE,FALSE]	TRUE indicates that leakage current has been detected at the heating element. Must be indicated by the hardware.
`bShortCircuit`	1	[TRUE,FALSE]	TRUE indicates that a short circuit has been detected at the heating element. Must be indicated by the hardware.
`bOpenCircuit`	1	[TRUE,FALSE]	TRUE indicates that an open circuit has been detected at the heating element. Must be indicated by the hardware.
`sControllerParameter`	none	Structure	General parameters (sampling time etc.) are passed to the function block in this structure.
`sParaControllerExternal`	none	Structure	An external controller parameter set is passed to the function block in this structure.

Outputs

Name	Unit	Value range	Description
`fYAnalog`	none	LREAL	Analog control value.
`bYPWMPos`	none	[TRUE,FALSE]	Boolean output, pulse width modulated. Positive/heating mode
`bYPWMNeg`	none	[TRUE,FALSE]	Boolean output, pulse width modulated. Negative/cooling mode
`bYDigPos`	none	[TRUE,FALSE]	Boolean output of a three-step controller (TRUE control value 100%, FALSE control value off)
`bYDigNeg`	none	[TRUE,FALSE]	Boolean output of a three-step controller (TRUE control value -100%, FALSE control value off)
`dwAlarm`	none	DWORD	Alarm messages (see ENUM ...)
`fMaxOverShoot`	°C	LREAL	max. overshoot in °C above/below setpoint.
`tStartUpTime`	TIME	-	Startup time until the setpoint is reached for the first time.
`eCtrlState`	none	E_CTRL_STATE	Current controller state (see ENUM ...)
`sParaControllerInternal`	none	Structure	In this structure the internal controller parameter set (determined by the tuning) is made available.
`bError`	none	[TRUE,FALSE]	If an error is present, then bError is TRUE.
`iErrorId`	none	INT	If bError is TRUE, then iErrorId provides an error code (see ENUM ...)